package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.PasswordConstant;
import com.sky.constant.StatusConstant;
import com.sky.context.BaseContext;
import com.sky.dto.EmployeeDTO;
import com.sky.dto.EmployeeLoginDTO;
import com.sky.dto.EmployeePageQueryDTO;
import com.sky.dto.PasswordEditDTO;
import com.sky.entity.Employee;
import com.sky.exception.AccountLockedException;
import com.sky.exception.AccountNotFoundException;
import com.sky.exception.PasswordEditFailedException;
import com.sky.exception.PasswordErrorException;
import com.sky.mapper.EmployeeMapper;
import com.sky.result.PageResult;
import com.sky.service.EmployeeService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.util.DigestUtils;

import java.time.LocalDateTime;
import java.util.List;

@Service
@Slf4j
public class EmployeeServiceImpl implements EmployeeService {

    @Autowired
    private EmployeeMapper employeeMapper;

    /**
     * 员工登录
     *
     * @param employeeLoginDTO
     * @return
     */
    public Employee login(EmployeeLoginDTO employeeLoginDTO) {
        String username = employeeLoginDTO.getUsername();
        String password = employeeLoginDTO.getPassword();

        //1、根据用户名查询数据库中的数据
        Employee employee = employeeMapper.getByUsername(username);

        //2、处理各种异常情况（用户名不存在、密码不对、账号被锁定）
        if (employee == null) {
            //账号不存在
            throw new AccountNotFoundException(MessageConstant.ACCOUNT_NOT_FOUND);
        }

        //密码比对
        // 后期需要进行md5加密，然后再进行比对
        // 将密码进行 md5 加密后与取出来的进行对比
        password = DigestUtils.md5DigestAsHex(password.getBytes()) ;
        if (!password.equals(employee.getPassword())) {
            //密码错误
            throw new PasswordErrorException(MessageConstant.PASSWORD_ERROR);
        }

        if (employee.getStatus() == StatusConstant.DISABLE) {
            //账号被锁定
            throw new AccountLockedException(MessageConstant.ACCOUNT_LOCKED);
        }

        //3、返回实体对象
        return employee;
    }

    /**
     * 新增员工
     *
     * @param employeeDTO
     */
    @Override
    public void save(EmployeeDTO employeeDTO) {
        log.info("当前线程的id：{}" , Thread.currentThread().getId());
        // 创建一个实体类
        Employee employee = new Employee() ;

        //复制属性
        BeanUtils.copyProperties(employeeDTO , employee);

        /*
        //补充属性

        //设置创建时间和创建人
        employee.setCreateTime(LocalDateTime.now());
        employee.setUpdateTime(LocalDateTime.now());

        //  后期需要改为当前登录用户的 id
        // 获取当前登录用户的 id
        Long empId = BaseContext.getCurrentId() ;
        employee.setCreateUser(empId);
        employee.setUpdateUser(empId);
         */

        //默认状态为启用
        employee.setStatus(StatusConstant.ENABLE);

        //设置默认密码
        employee.setPassword(PasswordConstant.DEFAULT_PASSWORD);

        //插入数据
        employeeMapper.insert(employee) ;
    }

    /**
     * 员工分页查询
     *
     * @param employeePageQueryDTO
     * @return
     */
    @Override
    public PageResult pageQuery(EmployeePageQueryDTO employeePageQueryDTO) {
        //使用 PageHelper 插件 这个插件是 MyBatis 提供的
        //设置初始参数
        PageHelper.startPage(employeePageQueryDTO.getPage() , employeePageQueryDTO.getPageSize()) ;

        //开始查询  要用 name 模糊匹配
        Page<Employee> page = employeeMapper.pageQuery(employeePageQueryDTO) ;

        //封装查询结果
        Long total = page.getTotal() ;
        List<Employee> employeeList = page.getResult() ;
        PageResult pageResult = new PageResult(total , employeeList) ;

        return pageResult ;
    }

    /**
     * 启用或禁用员工账号
     *
     * @param status
     * @param id
     */
    @Override
    public void startOrStop(Integer status, Long id) {
        // update employee set status = #{status} where id = #{id}
        //获取当前登录用户的 id
        Long empId = BaseContext.getCurrentId();
        Employee employee = Employee.builder()
                .id(id)
                .status(status)
                /*
                .updateUser(empId)
                .updateTime(LocalDateTime.now())
                 */
                .build();

        //修改员工信息
        employeeMapper.update(employee) ;
    }

    /**
     * 根据ID查询员工信息
     *
     * @param id
     * @return
     */
    @Override
    public Employee getById(Long id) {
        Employee employee = employeeMapper.getById(id) ;
        //隐藏密码
        employee.setPassword("****");
        return employee ;
    }

    /**
     * 编辑员工信息
     *
     * @param employeeDTO
     */
    @Override
    public void update(EmployeeDTO employeeDTO) {
        //构造实体类对象
        Employee employee = new Employee() ;
        BeanUtils.copyProperties(employeeDTO , employee) ;

        /*
        //获取当前登录用户的 id
        Long empId = BaseContext.getCurrentId() ;

        //设置修改人信息和修改时间
        employee.setUpdateTime(LocalDateTime.now());
        employee.setUpdateUser(empId);
         */

        //修改员工信息
        employeeMapper.update(employee);
    }

    /**
     * 员工密码修改
     * @param passwordEditDTO
     */
    @Override
    public void editPassword(PasswordEditDTO passwordEditDTO) {
        //获取当前登录用户的 id
        Long empId = BaseContext.getCurrentId() ;
        passwordEditDTO.setEmpId(empId);

        //根据员工 id 查询出员工信息
        Employee employee = employeeMapper.getById(passwordEditDTO.getEmpId()) ;

        //取出密码
        String password = employee.getPassword() ;

        //将传进来的旧密码进行 MD5 加密
        String oldPassword = DigestUtils.md5DigestAsHex(passwordEditDTO.getOldPassword().getBytes()) ;

        //将旧密码与密码进行比对
        if ( !password.equals(oldPassword)) {
            throw new PasswordEditFailedException(MessageConstant.PASSWORD_ERROR) ;
        }

        //将新密码进行 MD5 加密
        String newPassword =DigestUtils.md5DigestAsHex(passwordEditDTO.getNewPassword().getBytes()) ;

        //构造实体类对象
        employee.setPassword(newPassword);

        //修改密码
        employeeMapper.update(employee);
    }

}
